/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.mycompany.mavenproject1;

/**
 *
 * @author hedingwei
 */
public class Calculator {
    
    private double value;
    
    
    public void ac(){
            value =0;
            
    }
    
    public void add(double number){
        value += number;
    }
    
    public void substract(double number){
        if(value ==0){
              value =number;}
        else{
            value -= number;
        }
    }
    
    public void divide(double number){
        
        try{
             if(value ==0){
                 value =number;
                }
             else{
                   value = value/number;
                  }
        }catch(Exception e){
            // TODO
        }
       
    }
    
    public void multiply(double number){
            if(value ==0){
                 value =number;
                }
             else{
                value *= number;
                }
    }

    public double getValue() {
        return value;
    }
    
    
    
    public static void main(String[] args){
        Calculator calculator = new Calculator();
        calculator.add(10);
        calculator.substract(1);
        calculator.multiply(2);
        calculator.divide(2);
        System.out.println(calculator.getValue());
        calculator.ac();
        System.out.println(calculator.getValue());
    }
    
}
